[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.244403] kasan: CONFIG_KASAN_INLINE enabled [ 27.248149] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 27.249007] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.266116] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.272318] Modules linked in: [ 27.275488] CPU: 1 PID: 7959 Comm: syz-executor106 Not tainted 4.14.295-syzkaller #0 [ 27.283338] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 27.292666] task: ffff8880b48f8640 task.stack: ffff8880963b0000 [ 27.298698] RIP: 0010:__bfs.part.0+0x20e/0x470 [ 27.303249] RSP: 0018:ffff8880963b7370 EFLAGS: 00010007 [ 27.308582] RAX: 0000000001d0dd96 RBX: ffffffff8bc82250 RCX: 0000000000000000 [ 27.315823] RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000010 [ 27.323065] RBP: ffff8880963b7428 R08: 0000000000000000 R09: 0000000000001c0e [ 27.330307] R10: 0000000000000002 R11: 0000000000000001 R12: ffffffff8140f610 [ 27.337550] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 [ 27.344793] FS: 0000555557184300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 27.352993] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.358850] CR2: 0000000020000144 CR3: 00000000a92a6000 CR4: 00000000003406e0 [ 27.366095] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.373337] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.380578] Call Trace: [ 27.383207] ? is_bpf_text_address+0xb8/0x150 [ 27.387677] check_usage_backwards+0x167/0x2c0 [ 27.392235] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 27.397569] ? check_usage_forwards+0x2d0/0x2d0 [ 27.402209] ? save_trace+0xd6/0x290 [ 27.405898] mark_lock+0x3c7/0x1050 [ 27.409495] ? check_usage_forwards+0x2d0/0x2d0 [ 27.414139] __lock_acquire+0x594/0x3f20 [ 27.418175] ? mem_cgroup_commit_charge+0x17c/0x3b0 [ 27.423162] ? trace_hardirqs_on+0x10/0x10 [ 27.427367] ? trace_hardirqs_on+0x10/0x10 [ 27.431574] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 27.437003] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 27.441989] ? alloc_buffer_head+0x20/0x110 [ 27.446282] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 27.451702] lock_acquire+0x170/0x3f0 [ 27.455475] ? nilfs_bmap_lookup_at_level+0x6b/0x380 [ 27.460552] down_read+0x36/0x80 [ 27.463889] ? nilfs_bmap_lookup_at_level+0x6b/0x380 [ 27.468970] nilfs_bmap_lookup_at_level+0x6b/0x380 [ 27.473872] ? nilfs_bmap_get_dat+0xc0/0xc0 [ 27.478168] nilfs_mdt_submit_block.constprop.0+0x152/0x970 [ 27.483851] ? nilfs_mdt_write_page+0x250/0x250 [ 27.488496] nilfs_mdt_read_block+0x7c/0x320 [ 27.492884] ? nilfs_mdt_submit_block.constprop.0+0x970/0x970 [ 27.498838] ? finish_task_switch+0x178/0x610 [ 27.503305] ? finish_task_switch+0x14d/0x610 [ 27.507772] nilfs_mdt_get_block+0xc7/0xb90 [ 27.512075] ? nilfs_mdt_read_block+0x320/0x320 [ 27.516716] ? lock_downgrade+0x740/0x740 [ 27.520841] nilfs_palloc_get_block+0xb2/0x250 [ 27.525959] nilfs_palloc_get_entry_block+0x17d/0x230 [ 27.531225] nilfs_ifile_get_inode_block+0xb4/0x150 [ 27.536216] nilfs_iget+0x1c2/0x810 [ 27.539827] ? nilfs_iget_locked+0xb0/0xb0 [ 27.544052] ? nilfs_attach_log_writer+0x64d/0x9d0 [ 27.548985] ? nilfs_detach_log_writer+0x980/0x980 [ 27.553891] ? wait_woken+0x230/0x230 [ 27.557669] nilfs_get_root_dentry+0x24/0x1f0 [ 27.562141] nilfs_mount+0x984/0xd00 [ 27.565828] ? nilfs_attach_checkpoint+0x420/0x420 [ 27.570730] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 27.576151] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 27.581154] ? alloc_pages_current+0x15d/0x260 [ 27.585713] ? __lockdep_init_map+0x100/0x560 [ 27.590189] mount_fs+0x92/0x2a0 [ 27.593539] vfs_kern_mount.part.0+0x5b/0x470 [ 27.598091] do_mount+0xe65/0x2a30 [ 27.601609] ? do_raw_spin_unlock+0x164/0x220 [ 27.606083] ? copy_mount_string+0x40/0x40 [ 27.610380] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 27.615368] ? copy_mnt_ns+0xa30/0xa30 [ 27.619226] ? copy_mount_options+0x1fa/0x2f0 [ 27.623692] ? copy_mnt_ns+0xa30/0xa30 [ 27.627553] SyS_mount+0xa8/0x120 [ 27.630978] ? copy_mnt_ns+0xa30/0xa30 [ 27.634837] do_syscall_64+0x1d5/0x640 [ 27.638701] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 27.643983] RIP: 0033:0x7f5b3cecd55a [ 27.647673] RSP: 002b:00007ffc1e9af8e8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 [ 27.655358] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5b3cecd55a [ 27.662633] RDX: 0000000020000140 RSI: 0000000020000100 RDI: 00007ffc1e9af900 [ 27.669886] RBP: 00007ffc1e9af900 R08: 00007ffc1e9af940 R09: 00005555571842c0 [ 27.677130] R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000004 [ 27.684386] R13: 00007ffc1e9af940 R14: 000000000000003a R15: 0000000020000770 [ 27.691640] Code: 78 01 00 00 4d 8b 36 4c 39 f3 74 78 49 8d 7e 10 4c 89 f0 4c 8b 0d a3 69 a7 0a 48 89 fa 48 2d 60 9a c8 8b 48 c1 ea 03 48 c1 f8 06 <42> 80 3c 3a 00 0f 85 28 01 00 00 49 8b 4e 10 4c 8d 41 2c 4c 89 [ 27.710687] RIP: __bfs.part.0+0x20e/0x470 RSP: ffff8880963b7370 [ 27.716722] ---[ end trace ed54b10684919e04 ]--- [ 27.721445] Kernel panic - not syncing: Fatal exception [ 28.817827] Shutting down cpus with NMI [ 28.822047] Kernel Offset: disabled [ 28.825662] Rebooting in 86400 seconds..